(CBS News) Brooklyn, NY-- Scientists are testing a new pacemaker in the US, and doctors say the small device could have big benefits for some heart patients.

Researchers at Mount Sinai Hospital werethe first in the US to implant the new, experimental pacemaker, which is said to be smaller than a triple A battery.

"This device doesn't require surgery, so that means there is a low risk of infection," explained Dr. Vivek Reddy of Mount Sinai Hospital.

Surgeons use a catheter to guide the new device up through a vein in the leg and screw it directly into the heart muscle. Doctors say the new pacemaker doesn't have wires or leads, which may be another advantage.

"The problem is, if ever that lead has to be removed, then it's very difficult to remove that lead," Dr. Reddy added. "It's also a problem because that lead, which is what communicates with the heart, that lead can fracture."

Pacemakers are necessary when a patient's heart doesn't beat fast enough or work properly. Dr. Reddy says the procedure to takes five to 10 minutes, and the recovery is also faster.